[ce4]

In my case it was an embarrassing success story... my great uncles name was globally, or at least unique in Germany, i misspelled it, got the postcode wrong, forgot street and house number (sent from abroad)... and it arrived a month or so later. Boy got I laughed at. I'd rather wished it had disappeared. Thats was back in the 90's.

[kolinko]

Some other embarassing success story. My gf bought a postcard in Czech Republic, filled it with my address in Warsaw, but forgot to buy poststamps.

She didn't send the postcards and carried them to Warsaw. In Warsaw they fell out of her pocket on a street, or something like that.

Still, they arrived in our post box. We still don't have an idea how and why :)

[netsharc]

If it was already in Warsaw, it's possible some bored civilians found the postcard and decided to go to your address and put it in the mailbox...